Since the original big5 encoding (1984) is not supported anywhere (glibc and DOS-based systems uses big5 to mean big5-eten; Microsoft uses big5 to mean cp950), a conscious decision was made to alias big5 to big5-eten, which is the de facto superset of the original big5.

The CNS11643 encoding files are not complete. For common CNS11643 manipulation, please use EUC-TW in Encode::HanExtra, which contains planes 1-7.

The ASCII region (0x00-0x7f) is preserved for all encodings, even though this conflicts with mappings by the Unicode Consortium.